Audio speaker



FIG. 1 is a front elevational view of an audio speaker showing our new design;

FIG. 2 is a right side view;

FIG. 3 is a rear elevational view;

FIG. 4 is a top plan view;

FIG. 5 is a bottom plan view; and,

FIG. 6 is a rear perspective view. 

The ornamental design for an audio speaker, as shown and described. 